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Enhancement of the Thermoelectric Properties of FeGa3-type Structures with Group 6 Transition Metals: A Computational Exploration

Abstract : The possible existence of group 6 TM3 compounds with T = Cr, Mo, W and M = Ga, In is investigated with the aid of density functional theory calculations. Their most probable crystal structure is expected to be of the FeGa3 type tetragonal space group P42/mnm. All compounds are computed to be semiconductors with a band gap ranging from 0.08 to 0.43 eV, at the modified Becke-Johnson level of theory. The thermoelectric properties are analyzed via calculations based on Boltzmann transport equation under a constant relaxation time approximation. Promising power factors are computed for both n- and p-type WGa3 because of a band degeneracy around the Fermi level similar to that of heavily doped PbTe and SnTe materials. If the optimal chemical potential can be reached, a thermoelectric figure of merit up to 0.6 at 800 K for both n- and p-type may be expected for WGa3.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01501266
Contributor : Laurent Jonchère <>
Submitted on : Tuesday, April 4, 2017 - 9:41:22 AM
Last modification on : Thursday, March 5, 2020 - 2:03:59 PM

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Benoît Boucher, Rabih Al Rahal Al Orabi, Bruno Fontaine, Yuri Grin, Regis Gautier, et al.. Enhancement of the Thermoelectric Properties of FeGa3-type Structures with Group 6 Transition Metals: A Computational Exploration. Inorganic Chemistry, American Chemical Society, 2017, 56 (7), pp.4229-4237. ⟨10.1021/acs.inorgchem.7b00251⟩. ⟨hal-01501266⟩

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